| ReCrystallize.com, LLC | Virginia |
| Rectangled.io | |
| Rectify | Texas |
| Rectify Pharma | |
| Rectron Semiconductor | California |
| Recur360 Software, LLC | Arizona |
| Recurly, Inc. | California |
| Recurrency, Inc. | California |
| Recurrent Energy | California |
| Recurrent Technologies, Inc. | California |
| Recurrent Ventures | Florida |
| Recurring Capital Partners | Texas |
| Recurse Center | |
| Recursion | |
| Recursion Software, Inc. | Texas |
| Recurve Analytics, Inc. | California |
| Recycle SD, Inc. | California |
| Recycle Techs, Inc. | Washington |
| Recycle Video Games | Oregon |
| Recycling For Charities | Colorado |
| Red & Blue Ventures | Pennsylvania |
| Red 3 Media, Inc. | |
| Red 5 Interactive | |
| Red Arrow Therapeutics, Inc. | |
| Red Balloon Security, Inc. | New York |
| Red Barn Technology, Inc. | |
| Red Beard Digital | |
| Red Blue Quantum, Inc. | |
| Red Branch Media | |
| Red Bridge Internet, LLC | |
| Red Caffeine | |
| Red Canary | Colorado |
| Red Canoe Media | |
| Red Canyon Engineering and Software | |
| Red Canyon Software | Colorado |
| Red Carrot Design, Inc. | Alaska |
| Red Cat Studios | Florida |
| Red Cell Partners, LLC | Virginia |
| Red Chalk Studios | |
| Red Circle Agency | |
| Red Couch Interactive, LLC | Texas |
| Red Cow marketing, Inc. | |
| Red Crackle | California |
| Red Cup Agency | |
| Red Dash Media | New Jersey |
| Red Door Interactive, Inc. | California |
| Red Door Software, LLC | Virginia |
| Red e App | Kentucky |
| Red Echoes | |
| Red Energy Public Relations, Inc. | |